A 23-year-old man died after he was struck by a boulder tossed from a California overpass, the police said.

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The victim was sitting on the passenger side of a Toyota Corolla, with his his 21-year-old wife behind the wheel. The couple was traveling west on 134 Freeway near Pasadena when a 30- to 35-pound boulder crashed through the windshield, hitting the passenger.

The woman's mother and 4-year-old daughter were also in the vehicle. No other injuries were reported.

The woman drove straight to the Glendale Adventist Medical Center, where emergency personnel later pronounced the man dead. The victim was identified by KTLA as Christopher Lopez.

Officials believe that the large rock was intentionally thrown onto the freeway, CHP Altadena officers said in a Thursday press conference. Authorities are asking the public for help identifying the responsible party.

According to KTLA, the victim had recently learned of his wife's pregnancy.